GIGA INFORMATION GROUP INC
SC 13D/A, 2000-04-12
ENGINEERING, ACCOUNTING, RESEARCH, MANAGEMENT
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                                                                    Page 1 of 12

                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                                  SCHEDULE 13D

                    Under the Securities Exchange Act of 1934
                                (Amendment No. 1)

                          GIGA INFORMATION GROUP, INC.
                                (Name of Issuer)

                                  Common Stock
                         (Title of Class of Securities)

                                    37517m109
                                 (CUSIP Number)


                            Christopher E. Nordquist
                             WR Hambrecht & Co. LLC
                                 550 15th Street
                             San Francisco, CA 94107
                                 (415) 551-8657
                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)

                                    12/31/99
             (Date of Event which Requires Filing of this Statement)

If the filing person has previously  filed a statement on Schedule 13G to report
the  acquisition  that is the subject of this  Schedule  13D, and is filing this
schedule because of ss.ss.240.13d-1(e),  240.13d-1(f) or 240.13d-1(g), check the
following box [ ].

Note:  Schedules  filed in paper format shall include a signed original and five
copies of this schedule,  including all exhibits.  See ss.240.13d-7(b) for other
parties to whom copies are to be sent.

* The  remainder  of this cover page shall be filled out for a person's  initial
filing on this form with respect to the subject class of securities, and for any
subsequent  amendment  containing  information  which  would  alter  disclosures
provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
"filed" for the  purpose of Section 18 of the  Securities  Exchange  Act of 1934
("Act") or otherwise  subject to the  liabilities of that section of the Act but
shall be subject to all other provisions of the Act(however, see the Notes).


<PAGE>


CUSIP No. 37517m109                                                 Page 2 of 12

                                 SCHEDULE 13D

- --------------------------------------------------------------------------------
1               NAMES OF REPORTING PERSONS
                I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

                WR Hambrecht & Co. LLC
                943289837
- --------------------------------------------------------------------------------
2               CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                (SEE INSTRUCTIONS)                                       (a) (X)
                                                                         (b) ( )
- --------------------------------------------------------------------------------
3               SEC USE ONLY


- --------------------------------------------------------------------------------
4               SOURCE OF FUNDS (SEE INSTRUCTIONS)

                WC
- --------------------------------------------------------------------------------
5               CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
                ITEMS 2(d) or 2(e) (  )

- --------------------------------------------------------------------------------
6               CITIZENSHIP OR PLACE OF ORGANIZATION

                Delaware
- --------------------------------------------------------------------------------
NUMBER OF       7         SOLE VOTING POWER
SHARES
BENEFICIALLY              None
OWNED BY EACH
REPORTING
PERSON WITH
               -----------------------------------------------------------------
                8         SHARED VOTING POWER

                          1,553,500
               -----------------------------------------------------------------
                9         SOLE DISPOSITIVE POWER

                          None

               -----------------------------------------------------------------
                10        SHARED DISPOSITIVE POWER

                          1,553,500
- --------------------------------------------------------------------------------
11              AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                1,553,500
- --------------------------------------------------------------------------------
12              CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
                SHARES (SEE INSTRUCTIONS)(  )

- --------------------------------------------------------------------------------
13              PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                15.3%
- --------------------------------------------------------------------------------
14              TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                BD
- --------------------------------------------------------------------------------


<PAGE>


CUSIP No. 37517m109                                                 Page 3 of 12
                               SCHEDULE 13D

- --------------------------------------------------------------------------------
1               NAMES OF REPORTING PERSONS
                I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

                William R. Hambrecht

- --------------------------------------------------------------------------------
2               CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                (SEE INSTRUCTIONS)                                       (a) (X)
                                                                         (b) ( )
- --------------------------------------------------------------------------------
3               SEC USE ONLY


- --------------------------------------------------------------------------------
4               SOURCE OF FUNDS (SEE INSTRUCTIONS)

                N/A
- --------------------------------------------------------------------------------
5               CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
                ITEMS 2(d) or 2(e) (  )
- --------------------------------------------------------------------------------
6               CITIZENSHIP OR PLACE OF ORGANIZATION

                United States of America
- --------------------------------------------------------------------------------
                7        SOLE VOTING POWER
NUMBER OF
SHARES                   None
BENEFICIALLY
OWNED BY
EACH
REPORTING
PERSON WITH
               -----------------------------------------------------------------
                8        SHARED VOTING POWER

                         1,553,500
               -----------------------------------------------------------------
                9        SOLE DISPOSITIVE POWER

                         None

               -----------------------------------------------------------------
                10       SHARED DISPOSITIVE POWER

                         1,553,500
- --------------------------------------------------------------------------------
11              AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                1,553,500 (1)
- --------------------------------------------------------------------------------
12              CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
                SHARES (SEE INSTRUCTIONS) (  )

- --------------------------------------------------------------------------------
13              PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                15.3%
- --------------------------------------------------------------------------------
14              TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                IN
- --------------------------------------------------------------------------------

(1) Mr. Hambrecht has a 24.7% ownership interest in WR Hambrecht & CO. LLC. Mr.
Hambrecht disclaims beneficial ownership of all the shares of Giga Information
Group, Inc. held directly by the LLC other than with respect to 383,715 shares
represented by his proportionate ownership interest in the LLC.


<PAGE>


CUSIP No. 37517m109                                                 Page 4 of 12


                            Statement on Schedule 13D

      This  Amendment  No. 1 amends and  supplements  the initial  Statement  on
Schedule 13D of WR  Hambrecht & Co. LLC ("LLC")  filed with the  Securities  and
Exchange Commission on December 7, 1999 with respect to the beneficial ownership
by the LLC of shares  of  common  stock,  $0.001  par  value per share  ("Common
Stock"), of Giga Information Group, Inc., a Delaware corporation ("Issuer"). The
filing of this  Amendment No. 1 is occasioned by the purchase of 113,000  shares
as described  in Item 5(c) below.  Except as set forth  below,  the  information
contained in the Original Statement is unchanged.

      To the extent that any  information is provided herein with respect to the
Issuer, such information is provided to the knowledge of the LLC.

ITEM 1.     SECURITY AND ISSUER.

      The  Original  Statement,  as amended  by the  Amendment  No. 1  ("Amended
Statement"),  relates to shares of the Common Stock, $0.001 par value per share,
of Giga  Information  Group,  Inc., a Delaware  corporation.  The address of the
Issuer's principal executive offices is 139 Mainstreet, Cambridge, MA 02142.

ITEM 2.     IDENTITY AND BACKGROUND.

      The Amended  Statement is being filed jointly by William R.  Hambrecht and
the LLC.

      (a)   (i)  WR Hambrecht & Co. LLC.
            (ii) William R. Hambrecht.

      (b)   (i) The LLC's  principal  business  address is 550 15th Street,  San
            Francisco,  CA 94103. (ii) Mr. Hambrecht's  principal address is 550
            15th Street, San Francisco, CA 94103.

      (c)   (i) The LLC is a Broker/Dealer.
            (ii) Mr. Hambrecht is the sole Manager of the LLC.

      (d)   During the past five  years,  neither the LLC or Mr.  Hambrecht  has
            been  convicted  in  a  criminal   proceeding   (excluding   traffic
            violations or similar misdemeanors).

      (e)   During the past five  years,  neither the LLC or Mr.  Hambrecht  has
            been party to a civil  proceeding  of a judicial  or  administrative


<PAGE>


CUSIP No. 37517m109                                                 Page 5 of 12


            body of competent  jurisdiction  and as a result of such  proceeding
            was or is subject to a  judgment,  decree or final  order  enjoining
            future violations of, or prohibiting or mandating activities subject
            to, federal or state securities laws, or finding any violations with
            respect to such laws.

      (f)   (i)  The LLC is organized under the laws of the State of Delaware.
            (ii) Mr. Hambrecht is a citizen of the United States of America.

ITEM 3      SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION

      Working Capital of the LLC.

ITEM 4.     PURPOSE OF TRANSACTION.

      The  acquisitions  of  Common  Stock  by the LLC  were  made as  long-term
investments of the LLC. Except as noted below, neither Mr. Hambrecht nor the LLC
has any present plans or proposals that relate to or would result in or cause:

      (a)   the  acquisition  by any  person  of  additional  securities  of the
            Issuer, or the disposition of securities of the Issuer;

      (b)   an   extraordinary   corporate   transaction,   such  as  a  merger,
            reorganization  or  liquidation,  involving the Issuer or any of its
            subsidiaries;

      (c)   a sale or transfer  of a material  amount of assets of the Issuer or
            any of its subsidiaries;

      (d)   any change in the present  board of directors or  management  of the
            Issuer,  including  any plans or  proposals  to change the number or
            term of directors or to fill any existing vacancies on the board;

      (e)   any material change in the present capitalization or dividend policy
            of the Issuer;


<PAGE>


CUSIP No. 37517m109                                                 Page 6 of 12


      (f)   any other  material  change in the  Issuer's  business or  corporate
            structure;

      (g)   changes in the Issuer's charter, bylaws or instruments corresponding
            thereto or other actions which may impede the acquisition of control
            of the Issuer by any person;

      (h)   a class of securities of the Issuer being  de-listed from a national
            securities  exchange or to cease to be authorized to be quoted in an
            interdealer  quotation  system of a registered  national  securities
            association;

      (i)   a class of equity  securities  of the Issuer  becoming  eligible for
            termination  of  registration  pursuant  to Section  12(g)(4) of the
            Securities Exchange Act of 1934; or

      (j)   any action similar to any of those enumerated above.

      The filing  persons  reserve  the right to adopt such plans and  proposals
subject  to  applicable  regulatory  requirements,   if  any;  and  to  transfer
securities of the Issuer  directly  and/or sell  securities of the Issuer in the
open market.

ITEM 5.     INTEREST IN SECURITIES OF THE ISSUER.

      (a)   According  to the  Issuer,  there were  10,143,607  shares of Common
Stock  outstanding  as of  March  16,  2000.  The LLC  currently  directly  owns
1,553,500  shares  of the  Issuer's  Common  Stock,  representing  15.3%  of the
outstanding  Common  Stock.  Mr.  Hambrecht  does not directly own any shares of
Common Stock of the Issuer.  Mr. Hambrecht,  as the sole Manager of the LLC, has
indirect  beneficial  ownership of the 1,553,500 shares of Common Stock owned by
the LLC. Mr.  Hambrecht also has a 24.7%  ownership  interest in the corporation
that owns  100% of the LLC.  Accordingly,  Mr.  Hambrecht  disclaims  beneficial
ownership of all shares of the Issuer held by the LLC other than with respect to
383,715 shares represented by his proportionate ownership interest in the LLC.

      (b)   The LLC  and  Mr.  Hambrecht  each  have  shared  voting  power  and
dispositive power over the 1,553,500 shares of Common Stock held by the LLC.

      (c)   Except as set forth  below,  neither Mr.  Hambrecht  nor the LLC has
effected any transaction  involving the Issuer's Common Stock during the 60 days
prior to the date of this Amended Statement.

            Subsequent to July 15, 1999,  the LLC made the following open market
purchases of Common  Stock  (items 9 through 75 were  purchases or sales made by
the LLC in its capacity as market  maker for the Common  Stock) (all dates shown
are settlement dates except items 3, 6 and 7):

      1.    Purchase of 1,200 shares of Common Stock on July 23, 1999 at $6.1247
per share;

      2.    Sale of 1,200 shares of Common Stock on July 23, 1999 at $6.4697 per
share;


<PAGE>


CUSIP No. 37517m109                                                 Page 7 of 12


      3.    Purchase of 575,000  shares of Common Stock on September 15, 1999 at
$4.5955 per share;

      4.    Purchase  of 5,000  shares of  Common  Stock on  October  6, 1999 at
$4.2513 per share;

      5.    Sale of 100 shares of Common  Stock on October  13, 1999 at $ 4.4395
per share;

      6.    Purchase  of 275,000  shares of Common  Stock on November 3, 1999 at
$2.8126 per share;

      7.    Purchase of 175,500  shares of Common  Stock on November 15, 1999 at
$3.0626 per share;

      8.    Sale of 4,900 shares of Common Stock on November 24, 1999 at $4.2119
per share;

      9.    Purchase of 1,000  shares of Common  Stock on  December  23, 1999 at
$4.2541 per share;

      10.   Sale of 100 shares of Common  Stock on  December  23, 1999 at $4.595
per share;

      11.   Purchase  of 100  shares of Common  Stock on  December  27,  1999 at
$4.4153 per share;

      12.   Purchase of 1,987  shares of Common  Stock on  December  28, 1999 at
$4.3791 per share;

      13.   Sale of 300 shares of Common  Stock on December  28, 1999 at $4.8614
per share;

      14.   Purchase of 1,000  shares of Common  Stock on  December  29, 1999 at
$4.7541 per share;

      15.   Sale of 387 shares of Common  Stock on December  29, 1999 at $4.8540
per share;

      16.   Purchase of 49,700  shares of Common  Stock on December  30, 1999 at
$4.5784 per share;

      17.   Sale of 400 shares of Common  Stock on December  30, 1999 at $4.6148
per share;

      18.   Purchase of 62,900  shares of Common  Stock on December  31, 1999 at
$4.1116 per share;

      19.   Sale of 700 shares of Common  Stock on December  31, 1999 at $4.2147
per share;


<PAGE>


CUSIP No. 37517m109                                                 Page 8 of 12


      20.   Sale of 300 shares of Common Stock on January 3, 2000 at $4.5845 per
share;

      21.   Purchase  of 4,500  shares of  Common  Stock on  January  4, 2000 at
$4.2510 per share;

      22.   Sale of 5,800  shares of Common  Stock on January 5, 2000 at $4.1818
per share;

      23.   Sale of 1,000  shares of Common  Stock on January 6, 2000 at $4.5502
per share;

      24.   Purchase  of 800  shares  of Common  Stock on  January  11,  2000 at
$4.3801 per share;

      25.   Sale of 200 shares of Common  Stock on January  11,  2000 at $4.3547
per share;

      26.   Purchase  of 2,400  shares of Common  Stock on January  13,  2000 at
$4.6753 per share;

      27.   Sale of 500 shares of Common  Stock on January  13,  2000 at $4.8337
per share;

      28.   Purchase  of 1,300  shares of Common  Stock on January  14,  2000 at
$4.7562 per share;

      29.   Sale of 800 shares of Common  Stock on January  14,  2000 at $5.1778
per share;

      30.   Sale of 700 shares of Common  Stock on January  18,  2000 at $5.0776
per share;

      31.   Purchase  of 5,500  shares of Common  Stock on January  19,  2000 at
$5.9049 per share;

      32.   Sale of 6,200  shares of Common Stock on January 19, 2000 at $5.8159
per share;

      33.   Purchase  of 1,300  shares of Common  Stock on January  20,  2000 at
$5.7947 per share;

      34.   Sale of 4,400  shares of Common Stock on January 20, 2000 at $5.9208
per share;

      35.   Purchase  of 2,100  shares of Common  Stock on January  21,  2000 at
$6.0039 per share;

      36.   Sale of 1,700  shares of Common Stock on January 21, 2000 at $6.1691
per share;


<PAGE>


CUSIP No. 37517m109                                                 Page 9 of 12


      37.   Purchase  of 1,800  shares of Common  Stock on January  24,  2000 at
$6.0067 per share;

      38.   Sale of 1,000  shares of Common Stock on January 24, 2000 at $6.3707
per share;

      39.   Purchase  of 1,100  shares of Common  Stock on January  25,  2000 at
$6.0074 per share;

      40.   Purchase  of 1,500  shares of Common  Stock on January  26,  2000 at
$5.8804 per share;

      41.   Purchase  of 200  shares  of Common  Stock on  January  27,  2000 at
$6.3952 per share;

      42.   Sale of 4,200  shares of Common Stock on January 27, 2000 at $6.7176
per share;

      43.   Purchase  of 6,500  shares of Common  Stock on January  28,  2000 at
$7.0012 per share;

      44.   Sale of 4,000  shares of Common Stock on January 28, 2000 at $6.9478
per share;

      45.   Purchase  of 1,000  shares of Common  Stock on January  31,  2000 at
$7.0081 per share;

      46.   Sale of 2,900  shares of Common Stock on January 31, 2000 at $7.2900
per share;

      47.   Purchase  of 1,100  shares of Common  Stock on  February  2, 2000 at
$6.7630 per share;

      48.   Purchase  of 800  shares  of  Common  Stock on  February  7, 2000 at
$7.0051 per share;

      49.   Sale of 100 shares of Common  Stock on  February  7, 2000 at $7.3344
per share;

      50.   Purchase  of 100  shares  of  Common  Stock on  February  8, 2000 at
$7.0403 per share;

      51.   Purchase  of 800  shares of Common  Stock on  February  11,  2000 at
$8.0051 per share;

      52.   Sale of 3,600 shares of Common Stock on February 11, 2000 at $7.5497
per share;

      53.   Purchase of 2,453  shares of Common  Stock on  February  14, 2000 at
$10.1005 per share;


<PAGE>


CUSIP No. 37517m109                                                Page 10 of 12


      54.   Sale of 12,453  shares  of  Common  Stock on  February  14,  2000 at
$10.2821 per share;

      55.   Purchase of 4,500  shares of Common  Stock on  February  15, 2000 at
$8.3548 per share;

      56.   Sale of 2,200 shares of Common Stock on February 15, 2000 at $9.4813
per share;

      57.   Purchase  of 700  shares of Common  Stock on  February  16,  2000 at
$7.9401 per share;

      58.   Sale of 300 shares of Common  Stock on February  16, 2000 at $7.9863
per share;

      59.   Sale of 2,800 shares of Common Stock on February 17, 2000 at $7.7562
per share;

      60.   Purchase of 12,900  shares of Common  Stock on February  22, 2000 at
$8.0000 per share;

      61.   Sale of 1,900 shares of Common Stock on February 23, 2000 at $7.8750
per share;

      62.   Sale of 800 shares of Common  Stock on February  24, 2000 at $7.8750
per share;

      63.   Sale of 2,300 shares of Common Stock on February 28, 2000 at $7.8750
per share;

      64.   Sale of 200 shares of Common  Stock on February  29, 2000 at $7.8750
per share;

      65.   Purchase of 2,200 shares of Common Stock on March 2, 2000 at $8.2391
per share;

      66.   Sale of 1,400 shares of Common Stock on March 6, 2000 at $7.8569 per
share;

      67.   Purchase of 4,400 shares of Common Stock on March 7, 2000 at $8.0355
per share;

      68.   Purchase  of 1,200  shares  of  Common  Stock on March  15,  2000 at
$9.0834 per share;

      69.   Sale of 1,200  shares of Common  Stock on March 16,  2000 at $8.9893
per share;

      70.   Purchase of 400 shares of Common  Stock on March 20, 2000 at $8.9689
per share;


<PAGE>


CUSIP No. 37517m109                                                Page 11 of 12


      71.   Sale of 400 shares of Common  Stock on March 21, 2000 at $8.4997 per
share;

      72.   Sale of 3,500  shares of Common  Stock on April 3, 2000 at  $11.3636
per share;

      73.   Purchase of 3,500 shares of Common Stock on April 4, 2000 at $9.1071
per share;

      74.   Purchase  of 500 shares of Common  Stock on April 5, 2000 at $8.7500
per share; and

      75.   Sale of 500 shares of Common  Stock on April 5, 2000 at $8.7500  per
share;

      (d)   Except as set forth in this  Amended  Statement,  no other person is
known to have the  right to  receive  or the  power to  direct  the  receipt  of
dividends  from, or the proceeds from the sale of, the  securities of the Issuer
that are owned beneficially by the reporting persons.

      (e)   Item 5(e) is not applicable to this Amended Statement.

ITEM 6.     CONTRACTS,   ARRANGEMENTS,   UNDERSTANDINGS  OR  RELATIONSHIPS  WITH
RESPECT TO SECURITIES OF THE ISSUER.

      None.

ITEM 7.     MATERIAL TO BE FILED AS EXHIBITS.

      Exhibit A - Joint Filing Agreement dated as of April 12, 2000.


<PAGE>


CUSIP No. 37517m109                                                Page 12 of 12


                                   SIGNATURES

            After reasonable inquiry and to the best of my knowledge and belief,
I certify that the information set forth in this statement is true, complete and
correct.


Date:  April 12, 2000



                                    /s/ William R. Hambrecht
                                    ------------------------
                                    William R. Hambrecht



                                    WR Hambrecht & Co. Inc.

                                    By: William R. Hambrecht,
                                        Manager

                                    /s/ William R. Hambrecht
                                    ------------------------
                                    William R. Hambrecht


<PAGE>



                                    Exhibit A

                             Joint Filing Agreement

      William R. Hambrecht and WR Hambrecht & Co. Inc. ("Filing Persons") hereby
agree to file jointly a Schedule 13D and any amendments  thereto relating to the
common stock,  $0.001 par value per share, of Giga  Information  Group,  Inc., a
Delaware  corporation,   as  permitted  by  Rule  13d-1  promulgated  under  the
Securities  Exchange Act of 1943, as amended.  Each of the Filing Persons agrees
that the information  set forth in such Schedule 13D and any amendments  thereto
with respect to such Filing Person will be true,  complete and correct as of the
date of such Schedule 13D or such amendment, to the best of such Filing Person's
knowledge and belief, after reasonable inquiry. Each of the Filing Persons makes
no  representations  as to the accuracy or adequacy of the information set forth
in the Schedule 13D or any  amendments  thereto with respect to any other Filing
Person. Each of the Filing Persons shall promptly notify the other Filing Person
if any of the  information  set  forth  in the  Schedule  13D or any  amendments
thereto shall become inaccurate in any material respect or if said person learns
of information that would require an amendment to the Schedule 13D.

      IN WITNESS WHEREOF,  the undersigned have set their hands this 12th day of
April, 2000.



                                    /s/ William R. Hambrecht
                                    ------------------------
                                    William R. Hambrecht




                                    WR Hambrecht & Co. Inc.

                                    By: William R. Hambrecht,
                                        Manager


                                    /s/ William R. Hambrecht
                                    ------------------------
                                    William R. Hambrecht



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